#pragma once

#include <iostream>
#include <string>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "Log.hpp"
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <functional>
#include <unordered_map>

//using func_t = std::function<std::string(const std::string&,const std::string&,uint16_t)>;

Log lg;
int size = 1024;

enum
{
    SOCKET_ERR = 1,
    BIND_ERR
};

std::string defaultip = "0.0.0.0";
uint16_t defaultport = 8080;
class UdpServer{
public:
    UdpServer(const uint16_t &port = defaultport,const std::string &ip = defaultip):sockfd_(0),port_(port),ip_(ip),isrunning_(false)
    {}
    void Init()
    {
        //1.创建udp socket
        sockfd_ = socket(AF_INET,SOCK_DGRAM,0);
        if(sockfd_<0)
        {
            lg(Fatal,"soeket create error,sockfd: %d",sockfd_);
            exit(SOCKET_ERR);
        }
        lg(Info,"socket create success, sockfd: %d",sockfd_);

        //2. bind port
        struct sockaddr_in local;
        bzero(&local,sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(port_); //需要保证端口号是网络字节序列，因为端口是要发送给对方的
        //local.sin_addr.s_addr = inet_addr(ip_.c_str()); //1.string <->uint32_t  2.4字节ip必须是网络序列的
        local.sin_addr.s_addr = INADDR_ANY;

        int n = bind(sockfd_,(const struct sockaddr*)&local,sizeof(local));
        if(n<0)
        {
            lg(Fatal,"bind error, errno %d,err string:%s",errno,strerror(errno));
            exit(BIND_ERR);
        }
        
        lg(Info,"bind success, errno %d,err string:%s",errno,strerror(errno));
    
    }

    void CheckUser(const struct sockaddr_in& client,uint16_t clientport,std::string clientip)
    {
        

        auto iter = online_user_.find(clientip);
        if(iter==online_user_.end())
        {
            online_user_.insert({clientip,client});
            std::cout<<"["<<clientip<<":"<<clientport<<"] add to online_user"<<std::endl;
        }
    }

    void Broadcast(const std::string &info,const std::string clientip,uint16_t clientport)
    {
        for(const auto&user:online_user_)
        {
            std::string message = "[";
            message+=clientip;
            message+=":";
            message+=std::to_string(clientport);
            message+="]#";
            message+=info;
            socklen_t len = sizeof(user.second);
            sendto(sockfd_,message.c_str(),message.size(),0, (struct sockaddr*)(&user.second),len);
        }
    }
    void Run()  //func_t func 对代码进行分层
    {
        isrunning_=true;
        char inbuffer[size];
        while(isrunning_)
        {
            struct sockaddr_in client;
            socklen_t len = sizeof(client);
            ssize_t n = recvfrom(sockfd_,inbuffer,sizeof(inbuffer)-1,0,(struct sockaddr*)&client,&len);
            if(n<0)
            {
                lg(Warning,"recvfrom error, errno %d,err string:%s",errno,strerror(errno));
                continue;
            }
            inbuffer[n]=0;

            //获得client的ip和port
            uint16_t clientport = ntohs(client.sin_port);
            std::string clientip = inet_ntoa(client.sin_addr);
            CheckUser(client,clientport,clientip);

            std::string info = inbuffer;
            Broadcast(info,clientip,clientport);
            //std::string echo_string  = "server echo#"+info;
            //std::string echo_string = func(info,clientip,clientport);
            //sendto(sockfd_,echo_string.c_str(),echo_string.size(),0,(const struct sockaddr*)&client,len);
        }
    }

    ~UdpServer()
    {
        close(sockfd_);
    }


private:
    int sockfd_;    //网络文件描述符
    std::string ip_; // 任意地址绑定0
    uint16_t port_; //表明服务器进程的端口号
    bool isrunning_;
    std::unordered_map<std::string,struct sockaddr_in> online_user_;

};




